Find the perimeter of each of the following shapes :
(a) A triangle of sides 3 cm, 4 cm and 5 cm.
(b) An equilateral triangle of side 9 cm.
(c) An isosceles triangle with equal sides 8 cm each and third side 6 cm

Explanation

Perimeter of a triangle is equal to the sum of its sides.

(a) Perimeter of triangle of sides `3` cm, `4` cm and `5` cm`=(3+4+5)` cm

`=12` cm

(b) Perimeter of an equilateral triangle of side `9` cm `=(9+9+9)`cm

`=27` cm

(c) Perimeter of an isosceles triangle with equal sides `8` cm each and third side `6` cm `=(8+8+6)`cm

`=22` cm